#pragma once

#include <iostream>
#include <string>
#include <cstring>
#include <functional>
#include <memory>

#include <sys/socket.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <pthread.h>

#include "Log.hpp"
#include "LockGuard.hpp"
#include "InetAddr.hpp"

// 模板方法类模式
namespace socket_ns
{
    class Socket;

    const static int gbacklog = 8;
    using sock_sptr = std::shared_ptr<Socket>;
    enum
    {
        SOCKET_ERROR = 0,
        BIND_ERROR,
        USAGE_ERROR
    };

    class Socket
    {
    public:
        virtual void CreateSocketOrDie() = 0;
        virtual void BindSocketOrDie(InetAddr &addr) = 0;
        virtual void ListenSocketOrDie() = 0;
        virtual sock_sptr Accepter(InetAddr *addr) = 0;
        virtual bool Connetcor(InetAddr &addr) = 0;
        virtual int Sockfd() = 0;
        virtual int Recv(std::string *out) = 0;
        virtual int Send(const std::string &in) = 0;
        // virtual void Other() = 0;

    public:
        void BulidListenSocket(InetAddr &addr)
        {
            CreateSocketOrDie();
            BindSocketOrDie(addr);
            ListenSocketOrDie();
        }
        bool BulidClientSocket(InetAddr &addr)
        {
            CreateSocketOrDie();
            return Connetcor(addr);
        }
    };

    class TcpSocket : public Socket
    {
    public:
        TcpSocket(int fd = -1) : _sockfd(fd)
        {
        }
        void CreateSocketOrDie() override
        {
            // 1、创建流式套接字
            _sockfd = ::socket(AF_INET, SOCK_STREAM, 0);
            if (_sockfd < 0)
            {
                LOG(FATAL, "socket create error\n");
                exit(SOCKET_ERROR);
            }
            LOG(DEBUG, "socket create success, sockfd is : %d\n", _sockfd);
        }
        void BindSocketOrDie(InetAddr &addr) override
        {
            // 2、bind
            struct sockaddr_in local;
            local.sin_family = AF_INET;
            local.sin_port = htons(addr.Port());
            local.sin_addr.s_addr = inet_addr(addr.Ip().c_str());

            int n = bind(_sockfd, (struct sockaddr *)&local, sizeof(local));
            if (n < 0)
            {
                // 输出具体的错误信息
                LOG(FATAL, "bind error: %s\n", strerror(errno));
                exit(BIND_ERROR);
            }
            LOG(DEBUG, "bind success, sockfd is : %d\n", _sockfd);
        }
        void ListenSocketOrDie() override
        {
            // 3、tcp是面向连接的，所以通信之前,必须先建立连接，服务器是被连接的，
            //    tcpserver 启动，未来首先要一直等待客户的连接到来
            int n = listen(_sockfd, gbacklog);
            if (n < 0)
            {
                LOG(FATAL, "listen error\n");
                exit(BIND_ERROR);
            }
            LOG(DEBUG, "listen success, sockfd is : %d\n", _sockfd);
        }
        sock_sptr Accepter(InetAddr *addr) override
        {
            struct sockaddr_in peer;
            socklen_t len = sizeof(peer);
            int sockfd = ::accept(_sockfd, (struct sockaddr *)&peer, &len);
            if (sockfd < 0)
            {
                // LOG(WARNING, "accept error\n");
                return nullptr;
            }
            *addr = peer;
            sock_sptr sock = std::make_shared<TcpSocket>(sockfd);
            return sock;
        }
        bool Connetcor(InetAddr &addr) override
        {
            struct sockaddr_in server;
            memset(&server, 0, sizeof(server));
            server.sin_family = AF_INET;
            server.sin_port = htons(addr.Port());
            server.sin_addr.s_addr = inet_addr(addr.Ip().c_str());

            int n = connect(_sockfd, (struct sockaddr *)&server, sizeof(server));
            if (n < 0)
            {
                std::cerr << "connect error" << std::endl;
                return false;
            }
            return true;
        }

        int Recv(std::string *out) override
        {
            // 直接使用文件的读写接口来和客户端通信
            char inbuffer[1024];
            ssize_t n = ::recv(_sockfd, inbuffer, sizeof(inbuffer) - 1, 0);
            if (n > 0)
            {
                inbuffer[n] = 0;
                *out += inbuffer;
            }
            return n;
        }
        int Send(const std::string &in) override
        {
            int n = ::send(_sockfd, in.c_str(), in.size(), 0);
            return n;
        }

        int Sockfd() override
        {
            return _sockfd;
        }

    private:
        int _sockfd;
    };

    // class SockFactor
    // {
    // public:
    //     void
    // }
}